Why does this girl stare at me but never smile? Did I do something wrong?

Anonymous
I've seen her stare at another guy that she didn't even know and smile. I always say hi to her and she is friendly to everyone else that is close to me, but she doesn't talk to me. She stares at me alot. I caught her staring in an elevator at me and she just kept staring.
Why does this girl stare at me but never smile? Did I do something wrong?
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